Range extender / Bridge to work with Voyager 2110

Can anyone recommend a range extender/bridge that I can use with my Voyager 2110 which will work with WPA2 &/or WPA encryption?I currently use a Belkin Access Point configured as a bridge which works, but only with WEP encryption. An acceptable alternative would be a higher power antenna (if indeed these can be fitted to the Voyager 2110)Thanks,PGM